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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e54e92d16dba06ba978d61166a2b5b37f2193a40b5fd90a52dbc6c19d32796d' 
  AND token = 'Z4r8wkqf1zp3J6eh5qdAVXg57H3T6HWWbNs9a8MaSVQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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