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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '537c90ebec4608ea2efbbd18e8621442ae65f1cf928a6c912747950c3975139f' 
  AND token = 'DnIoo6f/kmCtIb15lVoy5em0tZ+RY527mFoM571nkao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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