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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4d14ee411598abac90c8a29e157cf11e115af01ffb3d5c7ee06f509848b36d1' 
  AND token = '/FAPAH2h4w1UqQrm27X3HUd/eq8Tyc6RVPU11N/IwAU=' 
  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"
    }
  }
}