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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6087cd9e185b1cf4722cf63230d5f032955417773375c72a0f1e8fb0928085bb' 
  AND token = 'mfy7ZCRhd5KNIyGV5JE2lZ12K+efmE8zLb+4Lxb1JuI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}