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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43b42f00a63b9ded5fd7d1568a2b4326a2a685ec4e243b88e71d3e5113108b0d' 
  AND token = 'c9VSC4+CXVHiPY/kempECVjYLC50yi7wbocvW6mKS/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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