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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5512bbcfeee1848addf09c4ddc70bf04da7ef9767914299bf3fede3da845471' 
  AND token = '5cbhPtg9g4p8+H2CK6eAO4+QbBlzmf3RyJ0pOjVl7YQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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