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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bdf7708c4a76268cf7f86291e51c77246ee6ab09a5fd7fbede6f872749ccd89' 
  AND token = 'H2LpmHKPl4KtyPQqbqxaTMIWsAbGJwljnEMwTrPHl8E=' 
  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"
    }
  }
}