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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e293148065df7dc9cac35f8d9848340011e8b1ce93980e0ec9327ced3b2cd667' 
  AND token = 'o2rrV2szN8ljuTzOT9t1kPTohgZuSnGyg8g9ejeiozc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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