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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '49df690416638db60091df754f64dc459235118bf8e46190d075f03d43657cbf' 
  AND token = 'b/qdnulMLDDGk2wJ/HeC9SnmyTM4KHC8w6kSWiawMns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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