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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df32d0e65d7d93392385940c2e84eefe3918d03f19ce11804c146fdd41b55a38' 
  AND token = '1kLTQ1DV+YS80JGY5k100NUq165sOMjEBBzCyORtBm0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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