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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f28763fa08da357e138126383b2f39e076410336c5d4d1941a43743be4e64034' 
  AND token = 'ggdW4DZ9a2MmhHuVdtEIR1kN6TzPAGqHUn/JBOzrqH4=' 
  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"
    }
  }
}