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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bb854e67e3d89a7d9855057d76a6d01d8c08411b344da884f3babe7b870bc2c' 
  AND token = '5W2c6pkmJvmEt8lJWAL5lwJLU0HK4PFZe0VCch3z/ao=' 
  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"
    }
  }
}