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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '485927d38cca32306fd68b7f723221e5888a1f91a343df3e997d483e9a0a0ea7' 
  AND token = '2Oa0ykQBjEox+1l4I9Ak8z0NvTZFAz/URJuexDCQ3Cg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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