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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a7d6712ee759b776a6578ae3092b01dfef6be24e380631ce4c29ed9dfad6064' 
  AND token = '61HtcItaMQ/EU7G8qeBh8q7z3LUnnwrS2R+MItUs5gg=' 
  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"
    }
  }
}