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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5af2d725fc71be6436ca36bc6ba8bd1e39c06cf289ef4d20506dd08014fde6e8' 
  AND token = 'mI1RRXI8Q2Wl01KY9aSTHWGFlVQqgLO6gmzvAq7B1t0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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