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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36b679584bf290ddf09d445c87baaefb15cf519f6ebfb212bd163e15b2c9a3cb' 
  AND token = 'Lnv4o9HS+wjvwM/0onfoQ3PMD+MIDtA08gfLmNBfKa8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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