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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ed14162d5e8ff6acfabc26c22043ea66aadf413f4f4d8157892bac5634fff76' 
  AND token = 'CZTHrejpcVwItro3dIFYNXcIOx9Q1Qb/to+k0/jV868=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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