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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82c842e725bfbcc9696ff3a9cf4429afd46f6aba8ce16e05327d34055b335ad6' 
  AND token = '+OSI5vz432Mw6gIGYtuxCJRhWNx3+EE9lgQwL5rXx2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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