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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab70876093088d730bf5b0849123c50b9dd0bf1005df4bdc5746ca6429718b5a' 
  AND token = 'Fg8mpXSwNFdleb03vS3hd8bKS3Rr8bEwSFVkZg1+tx8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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