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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a559910a03674527ed32bad5dfa53f13aeefcfa317c94aeb957e62f3c71f034f' 
  AND token = 'uh+TNrXMK2c5q6v9bkuGhxsOADBsYK2Ix2xP3olf+lI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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