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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '076a036890ada9c819102199b8d53db6615263cd4437ea1f8fd71709d1a7194e' 
  AND token = 'S1s/3czozv48CjlpzAPeof9rD7alW9Ul12Rr7dqmdlc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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