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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b888977aa3251ca7d89dc55e3ee485b2e64cb37b97f0a2daee7f07dbec9db5e7' 
  AND token = 'F7Z4qFR+yaiwkbYuuSVgJ8EvkqxN9ZPTLixhPjgU3TY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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