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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0fbee71e4e90de2a8aa2aa3eec9e5796d5b1e2a16c3edb53494467c6323ee4b' 
  AND token = 'cdYB5M23pZn2QUsv9tDrTR739XIyyuZzRD4Prh1asq8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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