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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f457cc54f8398cf3a9f84c1c59702cfb5a4e0f03b5c8035e322c48be9bdc86c' 
  AND token = 't9a0kduSRGugAmxcs0aBFfJxjIXDD8mg3dKxUy1kAGQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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