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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3c5052a667014ce1118e5634bb46f905c39d2cdcfb73e9cb164e0690919ebab' 
  AND token = 'xb7X1tAfrzoEDktZUjA0892wv1jLbJRfoCQLrfzLp6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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