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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6e084c908ab2668bdd32d7f95f964c2c9ec75e14a74d1423e09cf33e5983dd1' 
  AND token = '26pp6DLSIe7YctN9PitmT/+0DfvgE+1Eyn7ndnQd//Q=' 
  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"
    }
  }
}