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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a00ef0464058e42ed047e2c74019e11064409571b8fa858f4e8cd1929d0570d4' 
  AND token = 'qPdNEOdcnM9MloUwsY86JYm4ew7G+k3yMS9tvYc93S0=' 
  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"
    }
  }
}