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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '912466b6b9e21b1a9b9efbc5c8cfd9eabecfd639a0d90c1841b4e5edcc2e6882' 
  AND token = 'R8TmpR4xxQ1jaAimqUPTjhVu5mG92LP80E7J+3850qg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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