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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f95231599ab8808c1c26af26234d4081e8a7fe478abf67c8f5ea51a017e0687e' 
  AND token = '9QYPvu5w1Q35ZADSjBGGEH7Lw3dYuynV+Ac00olmveU=' 
  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"
    }
  }
}