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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17ba048741375da91d63d6ab048132daa92f22e60a09f96cde17b433bd3b85af' 
  AND token = 'dUUWKvGdAD7L1u9W6ciOnsuEoEurXZBB0NTJvWDbMJE=' 
  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"
    }
  }
}