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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60ee5d3279bf2632143b4410f8e6e475a405b50e1e6c0b1dc836ca56e3983c30' 
  AND token = 'UqIDe1O9lJhRzybZxhD6LW+s1WJ5ZqtMRFODRBbAO74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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