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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d722be01732e358e5ddbe867dd4a2116f73b48362ac4a767b80c100cfd8d4cc' 
  AND token = '+NdP0FC70VRx2A8XzUbaScmaFzlkHLvk7bV7+oRVVn8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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