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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e99be5da27e58811a0249ea21d8f7a1c85c276f991a0037210957277f2dcf18' 
  AND token = 'vrWj7F/su8LdupXw34DFHqiWLx/h9w/EUUKfw13r/Kk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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